Just did a regular ubuntu update on a laptop. Now in About>Details it says

Graphics: llvmpipe (LLVM 6.0, 256 bits)

It said "Intel Graphics (CofeeLake something...)" before the update. Also gnome-shell cpu usage went significantly up now. How to bring it back?

sudo lspci -v output (relevant lines):

VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07) (prog-if 00 [VGA controller])
Subsystem: Lenovo UHD Graphics 620
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
Memory at 90000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [40] Vendor Specific Information: Len=0c <?>
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [ac] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [100] Process Address Space ID (PASID)
Capabilities: [200] Address Translation Service (ATS)
Capabilities: [300] Page Request Interface (PRI)
Kernel modules: i915

Fixed, using steps 1 and 2 of the answer here: Ubuntu 18.04 not working with Intel Integrated Graphics

It explains how to force Xorg to use intel drivers. It is still a mystery why it stopped using them in the first place.

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